Steam prime mover for marine propulsion.



Witnesses .4

Q?. QU

Patented Aug. 17, 1915.

inventors Attneys.

v p or cerner, f sain novum. essIsNon 'ro rolas-stuur. snrrnnrnnrnecourrant', or a conronarron or Massacnusnr'rs. f

, STEAM .PRIME MOVERFOR MARINEPROVPULSIO.

Specification of Letters Patent.

Patenten aug. 1t, 1e15..

Application led January 20, 1912.- Serial No. 672,455.

`ToaZZ 'whomt't may concern:

A Be it known that we, CHARLES G.'CUn'r1.'s, a citizen of the UnitedStates, .res1ding 1n the borough of Manhattan, city, county, and

VState of New York, and RALPH L. LovELL, a

rtsiding at.

4citizen of the United States, Quincy, in the county of Norfolk andvSta-te of Massachusetts, have invented anew and l useful Improvement-inSteam Prime Movers for Marine Propulsion, of which the follow- 1n is aspecification. Y

nhe ob]ect we have,` in view is to provide a steam prime mover formarine propulsion, in which the from steam turbines, which improvedprime mover 1.will give a high .effic1ency at low .power and speed.

In carrying' out our invention, we provide each propeller shaft of atwin screw installa-- tion with a steamturbine adapted to utilize thevfull expansion of the steam. These steam turbines are preferably of thetype having 'initial impulse 'wheel stages, and under full powerconditions, the steam passes through the turbines in parallel, andindependently of each other. For lower power and speed, under whichvconditions the steam for efficient utilizapower turbines, there is pro-`one of the propeller shafts a flow would be too small tion in the fullvided upon highpressure cruising steam prime'mover,

which is preferably a. compound reciprocatingengine adapted to vbecoupled with, the shaft by a suitable clutch, such engine being adaptedto operate eiicientlycn the upper part of Athe steam expansion rangeiowrequired'for cruising conditions. vThe high pressure cruising primemover, instead ofv being a reciprocating engine; may be a steam turbineconnected by a clutch with the shaft, or permanently connectedtherewith, and having the necessaryizsmall steam portion of the steamexpansion range .with thesmall volume of steam required for cruise ing.lA steam connection ismade fromfthe exhaust of the high pressure cruisingprime mover to the full power steam turbine on v the other propellershaftfso that under cruising conditions, the steam How vwill -passthrough' the high pressure cruis' g p e mover into the turbine on theother ,shaft,

principal powerA is derived?- same purpose,

with the reduced Y' steam l Y ffinnozzles on one of passageways toeiciently utilize the upper `when the steam flows in which the lower'part of the steam expanvided for varying the intermediate pressure soas to sec-ure thisresult. The exhaust from the cruising'primemover,.\before it reaches the turbine on the othershaft, is connectedwith 'a manifold, from which a series of connections are made todifferent stages ofthe turbine. by valves, so thatrthe steam may beexhausted from the cruising prime mover 'into the turbine at diii'erentstages. As a further means for securing the proper distribution ofpressure, the connection of the manifold to the first stage of theturbine is made with a. series of nozzle sections controlled by valves,so that the Inozzle area may be adjusted. As a still further provisionfor the a valve controlled by-pass is provided around the secondcylinder of the compound steam-engine, or around some of the lowerstages of the cruising turbine, thel opening of which will still Y of atwin-screw arrangement.

` ln the accompanying drawing, Figure l is a plan view in outlineshowing the two propeller shafts with their prime movers connectedtherewith; plan of a-cruising steam. turbine whichmay -be used in placeof the cruising steam eng1ne; and F ig. 3 is a. sectional view showingthe means for varying the area of the cruisthe main turbines.

he main turbines 1, 2 are mounted on thepropeller s` afts 3, 4. They'have direct steam. connections 5, 6 from the boiler, and exhaust at 7',8. These steam turbines" are adapted each to utilize'the full expansionof the steam, under high power conditions,

through them in parallel. Coupled to the shaft 3 by a clutch 9,' is .acompound reciprocating engine 10,

which is a small lpower cruising engine.

These lconnections are controlled Fig. 2 is an ,outline ft arrangement,the two shafts on each/` pressure cylinder of the engine 1l).

service.

turbine 19 (Fig. 2) may may be provided with a valve-controlled by- 60propulsion,

Boiler steam is supplied to this engine through the pipe 11, and theexhaust therefrom is carried by a. pipe 12 to a manifold 13, from whicha number of connections 14 are made with the head of the turbine Zandwith the casing of that turbine at different stages. The connections 14are provided with controlling valves 15. The connection from themanifold 123 to the head of the tui'- bine 2 is iliade with a cruisingnozzle 1G (Fig. 3). different sections of which are adapted to be closedoli' from the-steam flow by means of valves li'. valve-controlledby-pass 18 is also provided around the low By these several means, theintermediate pressure or that in the pipe 12 can be varied under thedifferent conditions of power and speed, so as to distribute the energywith substantial equality between the cruising engine and the turbine.Under cruising conditions. the engine will be coupled with the shaft 3.and the steam will flow through the engine to the. turbine 2, theturbine 1 being out of Under high power conditions, the .engine will beuni-,oupled from the shaft, and the steam will be passed through the twomain turbines in parallel. Instead of a cruising engine on the shaft 3,a cruising be employed. This pass 20 around some of its lower stages,which bypass will be utilized to control the pressure distribution.

lVhat we claim is:-

1. In a ste-am prime mover for marine propulsion, the combination of twofull power steam turbines on separate shafts, a

high pressure cruising steam prime mover anon one shaft,

means for passing steam directly to the full power turbines in parallelfor high power and means for passlng the steam in succession through thecruising prime mover on one shaft and the full power Alt-urbino on theother shaft for lower powers,

substantially as set forth.

2. In a steam prime mover for marine propulsion, the combination of twofull power turbines on separate shafts, a high iiO pressure cruisingreciprocating engine removably connected'with one shaft, means forpassing steam directly to the full power turbines in parallel for highpower .and

means for passing the steam in succession i .through the reciprocatingengine on one shaft and the fulbpower turbine on the other shaft forlower powers, substantially as set forth. l

3. In a steam prime mover for marine the combination of two full powersteam turbines on separate shafts, a high pressure cruising steam primemover on one shaft, means for passing steam di- 'reetly to the fullpower turbines in parallel for high power, means for passing the steamsubstantially as set forth.

4. In a steam prime mover for marine propulsion, the combination of twofull power steam turbines on separate shafts, a high pressure cruisingsteam prime mover on one shaft, means for passing steam direetl y to thefull power turbines in parallel for high power, means for passing thesteam in succession through the cruising prime mover on one shaft andtheturbine on the other shaft for lower powers, the exhaust connectionsfrom the cruising prime mover to the turbine being made to differentstages of the turbine, substantially as'setforth.

5. In a steam primev mover for marine propulsion, the combination of twofull power steam turbines on separate shafts, a high pressure cruisingsteam prime mover on one shaft, means for directly to the full powerturbines in parallel for high power, means forpassing the steam insuccession through the cruising prime mover on one shaft and the turbineon vthe other shaft for lower powers and an adjustable cruising nozzleon the turbine, substantially as set forth.

V(. In a steam prilne mover for marine propulsion, the combination oftwo full power steam turbines on separate shafts, a high pressurecruising steam prime mover on one shaft, means for passing the steamdirectly to the full power turbines in parallel for'high power, meansfor passing the steam in, succession through the cruising prime mover onone shaft and the turbine on the other shaft for lower powers and abypass around the low pressure section of the cruising prime mover,substantially as set forth.

7. In a steam prime mover for marine propulsion, the combination withtwo shafts, of a high pressure steam prime mover on one shaft, and a'steam turbine on the other shaft, a passage connecting the said twomotor elements in succession, and controlling mechanism for controllingand varying the whereby an connections passing the steam prime mover tothe turbine being made to different stages ofthe turbine, substantiallyas set forth. 9. In a steam prime mover for marine propulsion, thecombination with two shafts. of a high pressure 'steam prime mover 0none shaft, and l shaft, means for passing the steam in successionthrough the high pressure steam prime mover kand the turbine, and anadjustable cruising nozzle on the turbine, substantially asset forth.

10. In a steam prime mover for marine propulsion, the combination withtwo shafts, of a compound high pressure steam prime mover on one shaft,and a steam turbine on the othershaft, means ,for passing the steam.`

by-pass around the l the high pressure steam ystantially as set forth.

a steam turbine on the other in succession through the high pressuresteam prime mover and the turbine, and a low pressure section of 20prime mover,- sub- This specification signed and witnessed this 16th dayof anual-v 1912.

-1 CHARLES G. CURTIS.

' RALPH L. LOVELL. [L.s. fitnesses to thesignature of Charles G. Curtis:s

JOHN L. LoTsCH,

Guo. J. HANsoN. lVitnesses to the signature of Ralph L. Lovell:

SAMUEL T. MACQUARRIE, [L.s.] LUCY C. HOLLIS. L. s]

